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Documentation-only assessment; no device was tested and no certification is claimed. Features depend on installed firmware and configuration. Reference profile: ordinary unencrypted data folders; named accounts, password rules and login-attempt blocking enabled. HTTPS management where stated. Storage rating describes the ordinary data folder and must not be read as a verified claim about all boot/system flash. None for prior attacks means no qualifying model-specific incident identified in focused vendor, NVD/CISA and security-research searches as of 2026-10-23. Frequency labels are qualitative assessor interpretations, not measured incident rates. Hardware tampering is rated Rare as a qualitative judgment for physical-access-dependent actions, not a measured frequency. Release-date scope: Official QNAP announcement date for TS-253E / TS-453E family; hardware field notes later RAM revision separately. Sales-status scope: Manufacturer advertises long-term availability and continued support; listing reviewed 2026-10-23. Proposed IDRS calculation under the assessment scope above: Device 2, System 2, User Authentication 2, total 6, grade B. Source methodology: https://fehmijaafar.net/wiki-iot/index.php/Methodology . This documentation-based rating is not an unconditional security certification. Firmware scope: QTS 5.2.x configuration, with applicable current security updates. Hardware release date is the model-family launch, not the later RAM-revision change. Additional references: * [https://www.qnap.com/en-uk/product/ts-253e/specs/hardware] * [https://www.qnap.com/en-us/product/ts-253e] * [https://docs.qnap.com/operating-system/qts/5.2.x/qts5.2.x-ug-en-us.pdf] * [https://www.qnap.com/en/security-advisory/qsa-26-05] * [https://www.qnap.com/en-ph/news/2022/qnap-launches-the-ts-253e-and-ts-453e-nas-2-and-4-bay-desktop-nas-with-long-term-availability-intel-celeron-j6412-processor-dual-2-5gbe-ports-m-2-pcie-slots-and-dual-4k-hdmi-outputs]
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